koko.org

ADpGn TIL that Mr. Rogers had a deep friendship with Koko, a gorilla who knew over 1000 words in sign language. He even had her on his series titled "You and I Together", dedicated to helping children get over their fears of meeting new people or being in different situations.
LKGQ TIL of Robin Williams’ bond with Koko the gorilla. He made her smile for the first time in 6 months after her lifelong gorilla companion passed and she became visibly upset when she heard the news of Williams’ death
Eeww TIL in 2001 Robin Williams befriended Koko the Gorilla. When told of his death, she signed the word for “Cry” and continued to be somber the rest of the day.